TreeItem:expand()

TreeItem:expand(expanding)method

Expands or collapses the subitems associated with the TreeItem.

Parameters

expanding

An optional boolean value indicating if the item should expand (true) or collapse (false).
If omitted, the TreeItem will toggle and collapse if it is already expanded, or expand if it is collapsed.

Return value

This function returns no value.

Example


--! luart-extensions
import ui

local win = ui.Window("TreeItem:expand() sample", 320, 220)
local tree = ui.Tree(win, {Item1 = {"SubItemA", "SubItemB", "SubItemC"}, "Item2", "Item3"}, 60, 40, 200, 160)
local button = ui.Button(win, "Expand/Collapse subitems", 86, 10)

function button:onClick()
  tree.selected:expand()
end

win:show()

while win.visible do
  ui.update()
  button.enabled = tree.selected ~= nil and tree.selected.count > 0
end